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When you breathing, you need to breath the cleaning air, the hair inside of your nose can removing some particles and pathogens to keep the air cleaning.

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The inspiration and expiration is related with the volume and pressure. When you do the inspiration, the volume inside of your thorax will increase and the pressure will decrease. The diaphragm and the ribcage move the chest cavity and pull open the lungs to let the oxygen goes into our body, so the volume will increase. The pressure decrease so the air can goes inside to our body. The air pressure is normal, so when the inside pressure decrease, then the air can goes into our body. When you do the expiration, the diaphragm muscles relax, and the diaphragm will bulges up, so it force to push the air out of your body. Then the volume decrease, pressure increase.

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The elastic recoil inside our alveoli helps to force the air out of the lungs

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When we do the expiration, both of these actions decrease the volume inside of the thorax, and the pressure is increase inside of the thorax.

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The muscle inside of the diaphragm relaxes, but when there are pressure the diaphragm is bulges up.

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This lowers the ribs downwards and inwards

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The external muscles relax, and the internal muscles contract.

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Since atmospheric pressure is become greater, air moves into the lungs, and the lungs will inflate.

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When we do the inspiration, both of these actions increase the volume inside of the thorax, and the pressure is decrease inside of the thorax.

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At the same time, the diaphragm is contracts and flatten. The diaphragm which is connect with the rib and lungs.

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The external muscles contract, and the internal muscles relax, the ribs are moving upwards and outwards.

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Breathing out

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Breathing in

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Referencehttp://cn.bing.com/images/searchview=detailV2&ccid=UG%2b1pLON&id=3D20000BBB88991D7BF66170DC4C91E20AD5C0C2&q=inhaled+and+exhaled+air&simid=607996705705165996&selectedIndex=8&ajaxhist=0

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Reference:http://cn.bing.com/images/searchview=detailV2&ccid=cb9sP1EZ&id=3D20000BBB88991D7BF65BF7CF25D7A86BAD481D&q=inhaled+and+exhaled+air&simid=608029295911832742&selectedIndex=9&ajaxhist=0

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We use the mouth and nose to breath, and the alveoli is where the place gas exchange. We need to breathe air then the air in order go to the lungs to get oxygen. We breathe the air out of our lungs to rid the carbon dioxide. The step of the gas exchange(where did the air through):1 mouth and nose;2 larynx;3 trachea;4 left and right bronchus;5 bronchioles;6 alveoli. The lungs are spongy organ, beside the lungs, there is rib protect them.

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Respiration is the release of energy from food substance in the living cells. There are two kind of respiration, one is aerobic respiration, another is anaerobic respiration. We usually use the aerobic respiration, when we doing exercise, we do the anaerobic respiration. Aerobic has oxygen, and it release more energy, anaerobic is without the oxygen, and it release less energy.

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Ventilation is let the fresh air to replace the harm air in your body. Ventilation has two action, inhaled and exhaled. Through this two action to let the circulation keep going.